20490559760 has 80 divisors (see below), whose sum is σ = 51994922112. Its totient is φ = 7447756800.

The previous prime is 20490559753. The next prime is 20490559879. The reversal of 20490559760 is 6795509402.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2804432 + ... + 2811728.

Almost surely, 2^20490559760 is an apocalyptic number.

20490559760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20490559760 is an abundant number, since it is smaller than the sum of its proper divisors (31504362352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20490559760 is a wasteful number, since it uses less digits than its factorization.

20490559760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10512 (or 10506 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 47.

The spelling of 20490559760 in words is "twenty billion, four hundred ninety million, five hundred fifty-nine thousand, seven hundred sixty".